Not really recs/reviews because at most I would say “good story.  Go read!”

Anyways, the first story I’m recommending is probably one that most people have already read, but that’s okay.  I’m just getting all the “popular” ones out there first and then move on to the more lesser known ones.  Unless you frequent fanfiction.net a lot, then you would have probably read everything that there is to read.

First up: 

RUMBLE! by TreeStar

ZoLu. Luffy ate a plate of RumbleBalls. Now he’s shrunk to 4 inches tall, and other severe side effects have put his health in jeopardy. He’s got Zoro & nakama to help him, but even one R-Ball will last a while in someone that small. Winner: Best Fic ‘08.

This is a completed story, amounting to 36 chapters for your pleasure.  Each chapter is a good length too, so if you’re looking for a long fic to read, this is one of them.  There is just a lot in each chapter and it can be somewhat overwhelming.  Not in terms of mind-blowing, twisted plot as this story is rather mellow, but simply there are a lot of emotions and nakama-bonding going on.  

So, good story.  Go read!